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Evaluation of the Purification Performance of the Kossodo Wastewater Treatment Plant in Ouagadougou

Journal of Environmental Protection 2021年第12期12卷 1128-1143页

作者： Bienvenue Joceline Sawadogo martine kone Rose Yamma Stéphane Nonet Philippe Walhain Roseline Kabore Toltama Sanou Théodore Nana Amado Ouedraogo H. Arsène Yonli National Centre for Scientific and Technological Research (NCSTR) Ouagadougou Burkina Faso UFR/SEA Joseph KI-ZERBO University Ouagadougou Burkina Faso Research and Expertise Center for Water (CEBEDEAU) Liege Belgium University of Liege-Start Tilman Liege Belgium National Office of Water and Sanitation (NOWS) Ouagadougou Burkina Faso

The efficiency of a wastewater treatment system is classically measured by the quality of its discharge into the aquatic environment. This quality can only be achieved if certain aspects are taken into account, such as the design and operation of the system in place. The objective of the present work is to evaluate the purification performance of this system after 17 years of operation. It should be noted that the lagoon plant (WWTP) has a total of eight basins, three of which are anaerobic (ANA). The evaluation of the physicochemical and microbiological parameters in the anaerobic basins and in the maturation basins allowed us to note slightly basic pH values in the maturation basins (8.7 to 9.2) against values from 6.8 to 7.4 in the anaerobic basins. Also, the values in terms of organic and bacteriological pollution have also evolved. For COD and BOD5, we obtained respectively abatements of more than 73% for filtered COD, 55% for gross COD and 81% for BOD5 even if the residual concentrations do not respect the standards of wastewater discharge in our country. Also, the residual concentrations of ammonia nitrogen in the output effluents (on average 12.43 mg/L), do not meet the standard of discharge into surface waters of Burkina Faso (1.29 mg/L). Thus, nutrients such as nitrogen and phosphorus pollution have average abatement rates of 31% and 27% respectively. In sum, we can say that the lagoon system set up does not meet the requirements in terms of quality of discharges, which remains an environmental problem for the receiving environment.

关键词： mixed Wastewater Natural Lagooning Nitrogen Phosphorus

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morphological Diversity and Distribution of <i>Garcinia kola</i>Heckel (Clusiaceae) in Two Agro-Ecological Areas of Côte d’Ivoire

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American Journal of Plant Sciences 2019年第10期10卷 1871-1887页

作者： Any Olivier Komenan Kouamé Kévin Koffi Ahou Anique Gbotto moussa kone Doffou Sélastique Akaffou Kouakou Laurent Kouakou Kouadio Ignace Kouassi Bi Irié Arsène Zoro Phytotechnical Unit and Genetic Improvement (PUGI) Training and Research Unit (TRU) of Science of Nature Nangui Abrogoua University Abidjan Cote d’Ivoire Agroforestry Training and Research Unit Jean Lorougnon Guédé University Daloa Cote d’Ivoire Science of Nature Training and Research Unit Nangui Abrogoua University Abidjan Cote d’Ivoire

The purpose of this study is to determine the morphological diversity and distribution of Garcinia kola Heckel (Clusiaceae) in two preferential agro-ecological growth areas in Cote d’Ivoire, for the sustainable management of the species. Ninety-four (94) trees of G. kola were sampled in Affery (south) and Biankouma (west) and characterized on the basis of 13 quantitative characteristics of the fruit, the general appearance of a plant, leaves and seeds. This study revealed the existence of very significant variability and differences within the trees sampled for most characteristics. Very strong correlations were found among the characteristics of the fruits. On the basis of these characteristics, it emerged that the fruits of the Biankouma area are larger than those of Affery. multivariate analyses show that diversity is structured with tree distribution into four distinct groups based on the following discriminating characteristics: fruit height (Hfr), leaf width (largF), seed mass (mgr) and trunk diameter (Dm). These parameters can be used as a basis for selecting and maintaining the high variability of G. kola. Analysis of the geographical distribution of trees, based on the nearest neighbour model, revealed an aggregate distribution in both areas.

关键词： Garcinia kola Heckel morphological Variability Geographical Distribution Discriminating Characteristics

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Aeromagnetic Imagery as a Tool to Help Identify the Structures Controlling the Emplacement of the Kenieba Kimberlite Pipes (Western mali, West African Craton)

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Open Journal of Geology 2023年第11期13卷 1177-1194页

作者： Baco Traore Gbele Ouattara marc Ephrem Allialy Ousmane Wane mohamed moustapha Ndam Njikam Adama Youssouf kone Souleymane Sangare Civil Engineering Geosciences and Geographic Sciences Laboratory Yamoussoukro C&#244te d’Ivoire Bamako Mali UFR-STRm University of Cocody Abidjan C&#244te d’Ivoire Laboratory of mineralogy and Petrology Faculty of Sciences and Techniques University of Sciences Techniques and Technologies of Bamako Bamako Mali School of Geology and mining Engineering University of Ngaoundere Ngaoundere Cameroon Faculty of Sciences and Technics (FST) University of Sciences Technics and Technologies of Bamako (USTTB) Bamako Mali

A kimberlite field, represented by fertile and sterile kimberlite pipes (chimneys) is located in the region of Kenieba (West mali, Kédougou-Kenieba inlier, West African Craton). Thirty pipes and kimberlite dykes have been identified in the birimian formations, composed mainly of metasediments and granitoids, covered by sedimentary formations (sandstones and conglomerates) of neoproterozoic age. All these formations are injected with dykes and doleritic sills of Jurassic age. The study of kimberlite pipes is still stammering in mali, and thus no previous study has allowed to characterize the structures controlling their implementation. The reinterpretation of aeromagnetic data validated by field work indicates that the major structures of the Kenieba region are oriented Nne-SSW, ne-SW, E-W and NW-SE. These structures (faults and kimberlite pipes) are often associated with dolerite dykes, which would imply an injection of dolerite magma into the other formations. The location of the known kimberlite pipes makes it possible to say that the direction NW-SE is the most favorable for the exploration of kimberlites in the region of Kenieba.

关键词： Kimberlite Pipes Doleritic Dykes Fractures Aeromagnetism Kenieba mali

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